Klein Tools has long been known for producing rugged, accurate, and dependable test instruments trusted by professionals. The Klein CL120 and CL220 clamp meters are both designed for electricians, HVAC techs, and service professionals who need reliable measurement tools in the field.
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This guide breaks down their main differences, strengths, and which one is right for you.
š Overview
The Klein CL120 is a well-balanced, auto-ranging digital clamp meter measuring up to 400 A AC and designed for everyday electrical diagnostics.
The Klein CL220 builds on the CL120ās foundation with added True RMS technology, built-in temperature measurement, and improved accuracy for more demanding applications.
š Specification Comparison
| Feature | Klein CL120 | Klein CL220 |
|---|---|---|
| AC Current Range | 400 A AC via clamp | 400 A AC via clamp |
| Voltage (AC/DC) | 600 V AC/DC | 600 V AC/DC |
| Resistance | Up to 20 MĪ© | Up to 20 MĪ© |
| Jaw Opening | 1.6ā³ (4.1 cm) | 1.6ā³ (4.1 cm) |
| Display Count | 2,000 counts, backlit LCD | 2,000 counts, backlit LCD |
| Special Features | Auto-ranging, NCVT (Non-Contact Voltage) | True RMS, temperature via thermocouple, NCVT |
| Drop Protection | Up to 2 m (6.6 ft) | Up to 2 m (6.6 ft) |
| Safety Rating | CAT III 600 V, Double Insulation | CAT III 600 V, Double Insulation |
| Temperature Range | Not specified | ā40 Ā°F to 1832 Ā°F (ā40 Ā°C to 1000 Ā°C) |
| š³ Pricing | š² Check Price | š² Check Price |
āļø Performance and Functionality
The CL120 is a dependable clamp meter tailored for routine electrical work – AC current measurement, voltage and resistance checks, and continuity testing with solid safety and durability.
The CL220, meanwhile, steps up with True RMS measurement for better accuracy on non-linear loads and an integrated temperature probe, making it ideal for HVAC and mechanical service work.
If you often test motors, variable-frequency drives, or circuits with complex waveforms, the CL220 offers extra capability. For standard wiring and panel diagnostics, the CL120 provides excellent value.
š§° Build and Design
Both meters feature Kleinās trademark rugged construction – durable housings, ergonomic form factors, and backlit displays. With their 2 m drop protection, these meters are built to withstand tough job-site conditions.
The CL220 maintains the same compact form while adding temperature measurement and improved internal circuitry for precision.
ā” Safety and Durability
Each model is CAT III 600 V rated and double-insulated for safety. Both include overload protection and solid mechanical durability. The CL220 extends its usefulness with True RMS accuracy, which ensures more reliable readings on modern electrical systems with distorted waveforms.
š” Ease of Use and Features
The CL120 and CL220 share similar control layouts – large rotary selectors, auto-ranging operation, data hold, and NCVT detection.
If you need temperature measurement or regularly deal with non-sinusoidal loads, the CL220 is the better choice. Otherwise, the CL120 is an easy, efficient everyday tool for general electrical work.
š§© Ideal Use Cases
| User Type | Recommended Model | Why |
|---|---|---|
| Residential Electrician | CL120 | Great performance at an affordable price |
| HVAC Technician | CL220 | Adds temperature measurement capability |
| Commercial Electrician | CL220 | True RMS and better load testing accuracy |
| DIY Enthusiast | CL120 | Easy to use, reliable for home projects |
š Verdict
If youāre looking for a reliable, job-ready clamp meter for everyday electrical tasks, the Klein CL120 is an excellent choice.
š View the Klein CL120 on Amazon
If you want more accurate readings on complex loads and need temperature measurement, the Klein CL220 is worth the upgrade.
š View the Klein CL220 on Amazon
In short:
- The CL120 is ideal for general electricians and homeowners.
- The CL220 is designed for professionals who need accuracy, flexibility, and temperature measurement in one compact meter.
